require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)

ruby_version_is "2.3" do
  describe "Enumerable#grep_v" do
    before :each do
      @numerous = EnumerableSpecs::Numerous.new(*(0..9).to_a)
      def (@odd_matcher = BasicObject.new).===(obj)
        obj.odd?
      end
    end

    describe "without block" do
      it "returns an Array of matched elements" do
        @numerous.grep_v(@odd_matcher).should == [0, 2, 4, 6, 8]
      end

      it "compares pattern with gathered array when yielded with multiple arguments" do
        (unmatcher = Object.new).stub!(:===).and_return(false)
        EnumerableSpecs::YieldsMixed2.new.grep_v(unmatcher).should == EnumerableSpecs::YieldsMixed2.gathered_yields
      end

      it "raises an ArgumentError when not given a pattern" do
        -> { @numerous.grep_v }.should raise_error(ArgumentError)
      end
    end

    describe "with block" do
      it "returns an Array of matched elements that mapped by the block" do
        @numerous.grep_v(@odd_matcher) { |n| n * 2 }.should == [0, 4, 8, 12, 16]
      end

      it "calls the block with gathered array when yielded with multiple arguments" do
        (unmatcher = Object.new).stub!(:===).and_return(false)
        EnumerableSpecs::YieldsMixed2.new.grep_v(unmatcher){ |e| e }.should == EnumerableSpecs::YieldsMixed2.gathered_yields
      end

      it "raises an ArgumentError when not given a pattern" do
        -> { @numerous.grep_v { |e| e } }.should raise_error(ArgumentError)
      end
    end
  end
end